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三平面平行-1
Author:
wenping168
GeoGebra
New Resources
异形操场
第八周作业
撒针估算面积实验
折扣
斐波那契螺旋弧线（表格法）
Discover Resources
百分數（小學）：折扣 / 賺賠（HTML5 版）
直線交點
托勒密定理的應用
棒形圖3
拋物線代數性質,光學性質
Discover Topics
Parametric Curves
Histogram
Scalene Triangles
Tangent Line or Tangent
Symmetry